Cyzrus
i'm not sure what you are thinking
the output power wires from the generator are for 120vac the go the transfer switch or manual plug in and from there to the circuit breaker panel
they are not useable for the solar controller
BUT IF you are talking about the 12v wire from the batteries for the generator starter, then 'MAYBE' they can be used for the charge controller
it depends on wheter that wire connects to the house battery or to chassis-engine battery ?
it can be wired either way, depends on what the builder did
if wired to the house batteries then yes you could use that for the charge controller connection to the house batteries 'maybe'
you see the the generator is probably grounded to the frame, NO negative wire going to the batteries
solar controllers are usually wired directly to the batteries with both the positive and negative wires, going direct
not using frame ground for negative
your controller may or may not work to charge the batteries using a frame ground instead of a direct run
MOST seem like an easy idea tricks
do not work to well with solar wiring in RV's
